	Authors	Year	Title
	Monakhova	1955	Nekotorye novye dannye po faune goniatitov i stratigrafii nizhnikh svit uglenosnoi tolshchi Karagandinskogo basseina. Trudy Laboratorii geologii uglia Akademia Nauk SSSR, 3: 96-115, 10 text-figs., pl.1-3.